Hi @pankaj2125,
Have you solved your problem?
Do you want to bulk update the records from gallery to SP list?
Could you please share a bit more about your scenario,like column type corresponding to the column you populate the Combo Box?
Generally, we update the grid in the gallery by setting the OnChange property of the control.
Patch(SPLIst,ThisItem,{TextColumn:Textinput1.Text, ChoiceColumn:{Value:ComboBox1.Selected.Value}})
You just need to insert a Checkbox within the Gallery to update the selected records.
1). Set the Checkbox OnCheck:
Collect(Toge,ThisItem)
2). Set the Checkbox OnUncheck:
Remove(Toge,ThisItem)
3). Add a button outside the Gallery and set the OnSelect:
Patch(SPList,Toge)